CN107517422B - Muffler and noise reduction earplug comprising same - Google Patents
Muffler and noise reduction earplug comprising same Download PDFInfo
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- CN107517422B CN107517422B CN201710938142.6A CN201710938142A CN107517422B CN 107517422 B CN107517422 B CN 107517422B CN 201710938142 A CN201710938142 A CN 201710938142A CN 107517422 B CN107517422 B CN 107517422B
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- 230000009467 reduction Effects 0.000 title abstract description 8
- 230000003584 silencer Effects 0.000 claims abstract description 16
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 210000005069 ears Anatomy 0.000 abstract description 4
- 230000001629 suppression Effects 0.000 abstract description 4
- 239000000428 dust Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
- G10K11/04—Acoustic filters ; Acoustic resonators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
- A61F11/06—Protective devices for the ears
- A61F11/08—Protective devices for the ears internal, e.g. earplugs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
- A61F11/06—Protective devices for the ears
- A61F11/08—Protective devices for the ears internal, e.g. earplugs
- A61F11/085—Protective devices for the ears internal, e.g. earplugs including an inner channel
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
- H04R2201/105—Manufacture of mono- or stereophonic headphone components
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Multimedia (AREA)
- Chemical & Material Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Fluid Mechanics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Veterinary Medicine (AREA)
- Biophysics (AREA)
- Otolaryngology (AREA)
- Psychology (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Vascular Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Signal Processing (AREA)
- Headphones And Earphones (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a silencer and a noise reduction earplug comprising the same, wherein the silencer comprises a plug body and a plug rod, a sound collecting cavity is arranged at the far ear end of the plug body, an outwards extending chamfer is arranged at the edge of the sound collecting cavity, a conducting cavity is arranged in the plug body and is arranged at the rear side of the sound collecting cavity, the conducting cavity is a cylinder or a reverse cone, the plug rod is plugged in the conducting cavity, the plug rod is attached to the conducting cavity, the plug rod is a cylinder or a cone, a through groove is formed in the outer surface of the plug rod along the axial direction, and the groove on the outer surface of the plug rod and the inner surface of the conducting cavity form a noise suppression cavity. The invention can keep the sound intensity of the part which is needed within the reasonable range which can be obtained by human ears while isolating harmful noise.
Description
Technical Field
The invention relates to the technical field of silencers for filtering noise, in particular to a silencer and a noise reduction earplug comprising the silencer.
Background
At present, various requirements for hearing protection in life and work are becoming more and more common, and various conventional sponges and plastic earplugs can reduce the decibel value of various sounds. In the market, the penetration of sound waves is reduced through tiny holes so as to reduce the intensity of middle and high frequency sound, but the reduction of partial frequency, particularly middle and low frequency noise, cannot be effectively controlled due to the diffraction characteristic of the sound waves.
Disclosure of Invention
Aiming at the problems and the shortcomings in the prior art, the invention provides a silencer and a noise reduction earplug comprising the same, which can isolate harmful noise and keep the required partial sound intensity within a reasonable range which can be acquired by human ears.
The invention solves the technical problems by the following technical proposal:
the invention provides a silencer which is characterized by comprising a plug body and a plug rod, wherein a sound collecting cavity is arranged at the far ear end of the plug body, a chamfer extending outwards is arranged at the edge of the sound collecting cavity, a conducting cavity is arranged in the plug body, the conducting cavity is arranged at the rear side of the sound collecting cavity, the conducting cavity is a cylinder or a reverse cone, the plug rod is plugged in the conducting cavity, the plug rod is attached to the conducting cavity, the plug rod is a cylinder or a cone, a through groove is formed in the outer surface of the plug rod along the axial direction, and a noise suppressing cavity is formed between the groove on the outer surface of the plug rod and the inner surface of the conducting cavity.
Preferably, a dust cover is arranged at the joint of the sound collecting cavity and the conducting cavity, the dust cover is tightly attached to the plug body or stuck to the plug body, at least one sound inlet hole is formed in the dust cover, the sound inlet holes are distributed on the surface of the dust cover, and the sound collecting cavity is communicated with the conducting cavity.
Preferably, the dust cover is mushroom-shaped, the dust cover is provided with a relatively large cover cap and a relatively thin elastic plug handle, the elastic plug handle is fixed with the cover cap, the cover cap covers the outer side of the conducting cavity, the elastic plug handle stretches into and is clamped in the conducting cavity, the sound inlet hole extends from the cover cap to the elastic plug handle, and the sound collecting cavity is communicated with the conducting cavity.
Preferably, the inner cavity of the elastic plug handle is hollow, the sound inlet holes are distributed on the inner side of the cap in a groove shape, and the sound inlet holes penetrate through the joint part of the elastic plug handle and the cap and extend into the hollow inner cavity of the elastic plug handle.
Preferably, the elastic plug handle is in a non-complete round shape, the sound inlet holes are distributed on the inner side of the cap in a groove shape, and the sound inlet holes penetrate through the joint part of the elastic plug handle and the cap and extend into the elastic plug handle.
Preferably, the conducting cavity is an inverted cone, the stopper rod is a cone, and the cone slope of the stopper rod is equal to the cavity cone slope of the conducting cavity; alternatively, the conducting cavity is a cylinder, and the stopper rod is a cone; or the conducting cavity is a cone, and the stopper rod is a cylinder; the conduction cavity and the stopper rod are both cylinders.
Preferably, the large end of the conducting cavity is the near-ear end, the small end of the conducting cavity is the far-ear end, the large end of the stopper rod is the near-ear end, the small end of the stopper rod is the far-ear end, the diameter of the large end of the conducting cavity is 0.5-4 mm, the diameter of the small end of the conducting cavity is 0.5-4 mm, and the length of the conducting cavity is 5-25 mm.
Preferably, the diameter of the large end of the conducting cavity is 2mm, the diameter of the small end of the conducting cavity is 1.8mm, and the length of the conducting cavity is 12mm.
Preferably, the diameter of the stopper rod is matched with the inner diameter of the conduction cavity, and the length of the stopper rod is 1mm-25mm.
Preferably, the depth of the groove is 0.01 to 0.5mm.
Preferably, the outer surface of the plug body is three-section, namely an irregular polyhedral end part, a middle connecting body and a plug-in end, the whole plug-in end is conical, and the diameter of the large end of the cone of the plug-in end is larger than that of the middle connecting body.
The invention also provides a noise-reducing earplug which is characterized by comprising the silencer and an earplug body, wherein the earplug body is provided with one or more layers of fins, the near-ear end of the silencer is inserted into an insertion hole of the earplug body, and the inner diameter of the insertion hole is smaller than the outer diameter of the near-ear end of the silencer.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that:
the invention can keep the sound intensity of the part which is needed within the reasonable range which can be obtained by human ears while isolating harmful noise.
Drawings
Fig. 1 is a schematic view of a muffler according to a preferred embodiment of the present invention.
Fig. 2 is an exploded view of the muffler according to the preferred embodiment of the present invention.
Fig. 3 is a cross-sectional view of a muffler according to a preferred embodiment of the present invention.
Fig. 4 is a schematic structural view of a dust cap according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a dust cap according to another embodiment of the present invention.
Fig. 6 and 7 are schematic structural views of a dust cap according to a further embodiment of the present invention.
Fig. 8 and 9 are schematic structural views of a dust cap according to another embodiment of the present invention.
Fig. 10 and 11 are schematic views of a plug body according to another embodiment of the present invention.
Fig. 12 and 13 are schematic structural views of a noise reduction earplug according to a preferred embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 3, the present embodiment provides a muffler composed of a stopper body 1 and a stopper rod 2. The far ear end of the plug body 1 is provided with a sound collecting cavity 101, and the edge of the sound collecting cavity 101 is provided with an outwards extending chamfer angle, so that external sound waves S1 can conveniently enter the silencer; a conducting cavity 102 is arranged at the rear side of the sound collecting cavity 101, and the conducting cavity 102 is a cylinder or a reverse cone; a stopper rod 2 is arranged in the conduction cavity 102, and the stopper rod 2 is a cylinder or a cone. For a better fit, the conducting cavity 102 is preferably an inverted cone and the stopper rod 2 is preferably a cone.
The shape selection of the conducting cavity 102 and the stopper rod 2 is mainly based on the fact that the stopper rod 2 can be tightly attached after being plugged into the conducting cavity 102; when this condition of close fitting is met, the conductive cavity 102 may be a cylinder and the stopper rod 2 a cone; or the conducting cavity 102 may be a cone and the stopper rod 2 a cylinder; even more, the conduction cavity 102 and the stopper rod 2 are both cylinders; it is ensured that after the stopper rod 2 is inserted into the conduction cavity 102, the two wall surfaces can be closely attached to each other in the axial direction due to the extrusion action.
The diameter of the large end of the conducting cavity 102 is 0.5-4 mm, preferably 2mm; the diameter of the small end of the conducting cavity 102 is 0.5-4 mm, preferably 1.8mm; the length of the conductive cavity 102 is 5-25 mm, preferably 12mm.
The stopper rod 2 is a cylinder or a cone, preferably a cone, and the diameter of the stopper rod 2 is the same as the inner diameter of the 102 conduction cavity; the length of the stopper rod 2 is 1mm-25mm, preferably 3mm-8mm; the outer surface of the stopper rod 2 is provided with a through groove 201 (see figure 2) along the axial direction; the depth of the groove 201 is 0.01 to 0.5mm, preferably 0.1 to 0.3mm depending on the actual use.
The taper of the stopper rod 2 is equal to the chamber taper of the conducting chamber 102; the small end of the stopper rod 2 is plugged into the conducting cavity 102 through the large end of the conducting cavity 102; the outer surface of the stopper rod 2 is closely attached to the inner surface of the conducting cavity 102; the grooves 201 on the outer surface of the stopper rod 2 form a noise suppressing cavity 3 with the inner surface of the conducting cavity 102; the external sound wave S1 enters the conducting cavity 102 through the sound collecting cavity 101 to form a sound wave S2; the sound wave S2 further propagates into the auditory canal through the noise suppression cavity 3, and the noise suppression cavity 3 is long and narrow, so that noise in the sound wave S2, particularly middle-low frequency noise, can be effectively suppressed, and a relatively soft sound wave S3 is formed and transmitted into the auditory canal.
The large end of the cone-shaped conducting cavity 102 is a near-ear end, and the small end of the conducting cavity 102 is a far-ear end; the large end of the cone stopper rod 2 is a near-ear end, and the small end of the stopper rod 2 is a far-ear end; so positioned, the stopper rod 2 is not easily removed from the conduction cavity 102 by external forces.
The noise suppression cavity 3 is formed by grooving the outer surface of the stopper rod 2, so that the stopper rod can be made thinner and longer according to requirements, various noises can be effectively suppressed, the production process is simpler, and the manufacturing cost is lower.
As shown in fig. 4, in order to prevent external impurities from entering the conducting cavity 102 of the plug body 1, affecting the filtering effect and solving the problem of difficult cleaning of the impurities, a dust cover 6 may be disposed at the connection between the sound collecting cavity 101 and the conducting cavity 102 of the plug body 1, where the dust cover 6 is tightly attached to the plug body 1 or adhered to the plug body 1; the dust cover 6 is provided with at least 1 sound inlet holes 601, and the at least 1 sound inlet holes 601 are distributed on the surface of the dust cover 6 and are used for communicating the sound collecting cavity 101 with the conducting cavity 102; the sound inlet hole 601 is mainly used for facilitating sound to enter the conducting cavity 102 and preventing sundries from entering the conducting cavity 102, so that the sound inlet hole 601 is required to be arranged in a region where the dust cover 6 is connected with the conducting cavity 102; the shape of the sound inlet 601 may be square, circular, or other regular or irregular shapes. Preferably, the sound inlet holes 601 are circular, and 1 in number are provided at the center of the dust cover 6.
As shown in fig. 5, another embodiment of the dust cap 6 is provided with a sound inlet 601, and the sound inlet 601 may be a special slot or other shapes, not limited to the square or round shape.
Preferably, as shown in fig. 6 and 7, the dust cap 6 may also take a mushroom-like form, with a larger cap 602, the cap 602 covering the outside of the conductive cavity 102; a thinner plug handle 603 which can extend into the conduction cavity 102 to realize looseness prevention; the plug handle 603 has certain elasticity and is clamped in the conducting cavity 102, so that the dust cover 6 can be conveniently detached and replaced; the sound inlet 601 extends from the cap 602 into the plug handle 603 to communicate the sound collecting cavity 101 with the conducting cavity 102; as shown in fig. 6 and 7, as a preferred embodiment, the inner cavity of the plug handle 603 is hollow, the sound inlet holes 601 are distributed on the inner side of the cap 602 in a groove shape, and the sound inlet holes 601 penetrate through the joint between the plug handle 603 and the cap 602 and extend into the hollow inner cavity of the plug handle 603.
Preferably, as shown in fig. 8 and 9, as another embodiment, the plug handle 603 is in a non-circular shape, and the sound inlet 601 is distributed on the inner side of the cap 602 in a groove shape; the sound inlet hole 601 penetrates through the joint part of the plug handle 603 and the cap 602 and extends to the non-round part of the plug handle 603; the conducting cavity 102 is communicated with the sound collecting cavity 101 and the outside through the sound inlet 601 and the non-circular plug handle 603.
In order to achieve a better sound collecting effect, the diameter below the inclined plane of the sound collecting cavity 101 is consistent with the diameter of the upper part of the conducting cavity 102, namely, the inclined plane of the sound collecting cavity 101 is directly connected with the conducting cavity 102.
Meanwhile, in order to ensure that the plug handle 603 of the dust cover 6 can be reliably plugged in the conducting cavity 102, the upper part of the conducting cavity 102, namely the part contacted with the plug handle 603, is designed into a surface matched with the plug handle 603, and can be cylindrical with consistent upper and lower diameters; or the plug handle 603 can be conical with small upper diameter and large lower diameter so as to facilitate plugging; the plug handle 603 can also be conical with a large upper diameter and a small lower diameter, and can be elastically expanded to prevent unexpected falling after being plugged in; even other concave-convex complex curved surfaces are mainly used for facilitating the plugging of the plug handle 603 and preventing the plug handle from falling off.
As shown in fig. 10 and 11, in another embodiment of the plug body 1, the plug body 1 also has a sound collecting cavity 101 and a conducting cavity 102; the outer surface of the plug body 1 is divided into 3 sections, which are respectively irregular polyhedral end parts 103, and the polyhedral design is convenient for holding the silencer body; a middle thinner connector 104 and a plug-in end 105; the whole tapered design of filling end 105 makes things convenient for filling in the supporting earplug body, and the cone major diameter of filling end 105 is greater than the diameter of connector 104 simultaneously, is in the supporting earplug body with the muffler of filling in 105, because the diameter of connector 104 is less than the cone major diameter of filling end 105, makes things convenient for the earplug body chamber to block the muffler here, helps the reliability of muffler installation.
As shown in fig. 12 and 13, the present embodiment further provides a noise reduction earplug, which is formed by combining the muffler 4 and the earplug body 5; the near-ear end of the silencer 4 is inserted into a plug hole of the earplug body 5, and the inner diameter of the plug hole is smaller than the outer diameter of the near-ear end of the silencer 4; the earplugs 5 are provided with one or more layers of fins and are made of flexible plastic, so that the earplugs can effectively fit into the auditory canal, and external sound waves can only be transmitted into the ears after being filtered by the silencer.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (7)
1. The silencer is characterized by comprising a plug body and a plug rod, wherein a sound collecting cavity is arranged at the far ear end of the plug body, a chamfer extending outwards is arranged at the edge of the sound collecting cavity, a conducting cavity is formed in the plug body, the conducting cavity is arranged at the rear side of the sound collecting cavity, the plug rod is plugged in the conducting cavity, the plug rod is attached to the conducting cavity, a through groove is formed in the outer surface of the plug rod along the axial direction, and a noise suppressing cavity is formed by the groove on the outer surface of the plug rod and the inner surface of the conducting cavity;
the dustproof cover is tightly attached to the plug body or stuck to the plug body, at least one sound inlet hole is formed in the dustproof cover, the sound inlet holes are distributed on the surface of the dustproof cover, and the sound collecting cavity is communicated with the conducting cavity;
the dustproof cover is mushroom-shaped, the dustproof cover is provided with a relatively large cover cap and a relatively thin elastic plug handle, the elastic plug handle and the cover cap are fixed, the cover cap covers the outer side of the conducting cavity, the elastic plug handle stretches into and is clamped in the conducting cavity, the sound inlet hole extends into the elastic plug handle from the cover cap, and the sound collecting cavity is communicated with the conducting cavity;
the inner cavity of the elastic plug handle is hollow, the sound inlet holes are distributed on the inner side of the cap in a groove shape, and the sound inlet holes penetrate through the joint part of the elastic plug handle and the cap and extend into the hollow inner cavity of the elastic plug handle;
or the elastic plug handle is in a non-whole round shape, the sound inlet holes are distributed on the inner side of the cap in a groove shape, and pass through the joint part of the elastic plug handle and the cap and extend to the non-whole round part to which the elastic plug handle extends; the conduction cavity is communicated with the sound collecting cavity and the outside through the sound inlet hole and the non-full-circular plug handle;
the conducting cavity is an inverted cone, the stopper rod is a cone, and the cone slope of the stopper rod is equal to the cavity cone slope of the conducting cavity.
2. The muffler of claim 1, wherein the large end of the conductive cavity is a proximal ear end and the small end is a distal ear end, the large end of the stopper rod is a proximal ear end and the small end is a distal ear end, the diameter of the large end of the conductive cavity is 0.5-4 mm, the diameter of the small end of the conductive cavity is 0.5-4 mm, and the length of the conductive cavity is 5-25 mm.
3. The muffler of claim 2, wherein the major end of the conductive cavity has a diameter of 2mm, the minor end of the conductive cavity has a diameter of 1.8mm, and the conductive cavity has a length of 12mm.
4. A muffler as claimed in claim 3, wherein the diameter of the stopper rod matches the inner diameter of the conductive cavity, and the stopper rod has a length of 1mm to 25mm.
5. The muffler of claim 1, wherein the depth of the groove is 0.01 to 0.5mm.
6. The silencer of claim 1, wherein the outer surface of the plug body is three-section, namely an irregular polyhedral end, an intermediate connector and a plug-in end, the whole plug-in end is conical, and the diameter of the large end of the cone of the plug-in end is larger than that of the intermediate connector.
7. A noise reducing earplug comprising the muffler of any one of claims 1-6 and an earplug body having one or more layers of fins, the proximal end of the muffler being inserted into an insertion hole of the earplug body, the insertion hole having an inner diameter smaller than the outer diameter of the proximal end of the muffler.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938142.6A CN107517422B (en) | 2017-09-30 | 2017-09-30 | Muffler and noise reduction earplug comprising same |
| PCT/CN2017/108302 WO2019061639A1 (en) | 2017-09-30 | 2017-10-30 | Sound attenuation device and noise-cancelling earplug having same |
| DE212017000344.8U DE212017000344U1 (en) | 2017-09-30 | 2017-10-30 | Muffler and outside noise suppressing earplugs that surrounds them |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938142.6A CN107517422B (en) | 2017-09-30 | 2017-09-30 | Muffler and noise reduction earplug comprising same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107517422A CN107517422A (en) | 2017-12-26 |
| CN107517422B true CN107517422B (en) | 2024-04-02 |
Family
ID=60726093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710938142.6A Active CN107517422B (en) | 2017-09-30 | 2017-09-30 | Muffler and noise reduction earplug comprising same |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN107517422B (en) |
| DE (1) | DE212017000344U1 (en) |
| WO (1) | WO2019061639A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108836630B (en) * | 2018-06-28 | 2020-07-14 | 广东工业大学 | Noise-proof earplug with silencing structure |
| JP7192486B2 (en) * | 2018-12-25 | 2022-12-20 | 株式会社Ｊｖｃケンウッド | Earplug |
| WO2022056415A1 (en) * | 2020-09-11 | 2022-03-17 | Triton Systems, Inc. | Passive non-linear acoustic filters |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019061639A1 (en) | 2019-04-04 |
| CN107517422A (en) | 2017-12-26 |
| DE212017000344U1 (en) | 2020-04-09 |
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